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Troy

Posted 15 June 2008 - 05:31 PM

Troy

Tech Staff

Technician

8,839 posts

Hi there,

Welcome to Geeks to Go!

There are plenty of answers out on Google if you want to go looking, start searching here. XP is a 32-bit operating system, (unless you specifically have 64-bit), which has a RAM limit of 4GB. Windows "allocates" part of your RAM for other uses, hence only showing a smaller amount. This amount is usually around 3-3.25GB, but is obviously a bit lower in your case, as every computer is different.

Dopher

Posted 17 June 2008 - 12:30 PM

Dopher

New Member

Topic Starter

Member

3 posts

I believe it is dual channel and it is in the appropriate slots. The strange thing, to me, is the BIOS show 2GB per slot, so the system board recognizes 4GB, but Windows XP Pro 32bit only sees 2.5GB. I even rebuilt the box, cuz i had to anyway, and got the same thing.

spsanderson

Posted 12 April 2010 - 09:05 PM

SpywareDr

Posted 13 April 2010 - 03:03 AM

SpywareDr

Member 2k

Member

2,771 posts

Various devices in a typical computer require memory-mapped access space which must reside within the first 4 GB of address space.

For example, if you have a video card that has 512 MB of onboard memory, that memory must be mapped within the first 4 GB of address space. This reduces the total amount of system memory that is available to the operating system by 512 MB.

The amount of reduction in available system memory depends on all the devices that are installed in the computer. If a computer has many installed devices, the available memory can be reduced to less than 3 GB.